He decided questions of war and peace, and re-established unity in Gaul by defeating the Neustrians and the Aquitanian followers of Duke Odo (Eudes) at Vincy in 717.
Among the more prominent of Priscillian's friends were two bishops, named Instantius and Salvianus, and Hyginus of Cordova also joined the party; but, through the exertions of Idacius of Emerita, the leading Priscillianists, who had failed to appear before the synod of Spanish and Aquitanian bishops to which they had been summoned, were excommunicated at Saragossa in October 380.
Took the field in aid of Richard; but the young king and Geoffrey had no scruples about withstanding their father, and continued to aid the Aquitanian rising until the young king fell ill of a fever which proved fatal to him (June II, 1183).
The objection raised by the Aquitanian presbyter Vigilantius (c. 400) to the belief that the souls of the martyrs to a certain extent clung to their ashes, and heard the prayers of those who approached them, appeared to his contemporaries to be frivolous;.
But though he met with sufficient success to encourage him to issue a charter in 858, dated "the first year of the reign in West Francia," treachery and desertion in his army, and the loyalty to Charles of the Aquitanian bishops brought about the failure of the enterprise, which Louis renounced by a treaty signed at Coblenz on the 7th of June 860.